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Total 26 documents matching your query.

1. [Amps] Overload Protection (score: 1)
Author: Mark K5AM <k5am@zianet.com>
Date: Sat, 20 Dec 2008 01:42:04 +0000
There have been some comments concerning arcing in amplifiers, and the resulting power supply damage. Circuits for overload protection are described in a web article "Overload Protection for High Vol
/archives//html/Amps/2008-12/msg00272.html (6,657 bytes)

2. [Amps] Regulated DC heater (score: 1)
Author: Mark K5AM <k5am@zianet.com>
Date: Sat, 24 Jan 2009 17:30:26 +0000
Gary ZL2IFB wrote: I'm contemplating how best to regulate the filament voltages on my amps, and curious as to whether it's possible to use a regulated DC supply . . . - - - - - - - - - - - - - - 73,
/archives//html/Amps/2009-01/msg00279.html (6,701 bytes)

3. [Amps] Remote power supply question (score: 1)
Author: Mark K5AM <k5am@zianet.com>
Date: Wed, 18 Feb 2009 18:41:18 +0000
Andy, 73, Mark, K5AM _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.com/mailman/listinfo/amps
/archives//html/Amps/2009-02/msg00549.html (6,489 bytes)

4. [Amps] Step-start; improved circuit. (score: 1)
Author: Mark K5AM <k5am@zianet.com>
Date: Sat, 07 Mar 2009 02:30:19 +0000
Some step-start circuit troubles have been reported recently. The step-start circuit usually seen can sometimes cause trouble; the problem is that the relay coil is part of the RC timing circuit. Thi
/archives//html/Amps/2009-03/msg00225.html (7,028 bytes)

5. [Amps] Grid-filament short blown out. (score: 1)
Author: Mark K5AM <k5am@zianet.com>
Date: Thu, 10 Sep 2009 18:01:07 +0000
There have been several postings concerning the possibility of removing a grid-filament short with a pulse of high voltage. I can only report on one case where it worked. My homebrew 6-meter push-pul
/archives//html/Amps/2009-09/msg00142.html (6,722 bytes)

6. [Amps] Separate B-minus connection is not necessary (score: 1)
Author: Mark K5AM <k5am@zianet.com>
Date: Fri, 06 Nov 2009 20:44:41 +0000
Separate B-minus connection is not necessary. A high voltage power supply should be usable with any amplifier having demands within its capabilities; a restrictive one-to-one amplifier-supply corresp
/archives//html/Amps/2009-11/msg00090.html (7,607 bytes)

7. [Amps] Indirectly heated cathodes (score: 1)
Author: Mark K5AM <k5am@zianet.com>
Date: Sun, 04 Apr 2010 04:17:21 +0000
alive" voltage to allow faster warm-up when full voltage is applied? <<< In my 2M amp I use a "Heater Idle" circuit. This does not shorten the initial 3 minute warm-up, but later, if I do not transmi
/archives//html/Amps/2010-04/msg00065.html (7,610 bytes)

8. Re: [Amps] Tube Amps as Antenna Tuners (score: 1)
Author: Mark K5AM <k5am@zianet.com>
Date: Thu, 27 Jan 2011 02:49:26 +0000
Amplifier that looks like a tuner . . . With a large rotary inductor and two vacuum variables rated 15 kV and 3 kV, my amplifier actually looks like an antenna tuner (with a tube in the corner). Tune
/archives//html/Amps/2011-01/msg00352.html (8,766 bytes)

9. [Amps] 4-400A low output, VU3RAZ problem (score: 1)
Author: Mark K5AM <k5am@zianet.com>
Date: Thu, 31 Mar 2011 19:07:24 +0000
Your screen voltage is insufficient. Do you have the data sheet, with specifications for class AB1? I use 810 volts on the screens and get 1200 W from two tubes in push-pull. www.zianet.com/k5am/amp
/archives//html/Amps/2011-03/msg00304.html (7,256 bytes)

10. Re: [Amps] Any designs for 4CX1000A on 2m ? (score: 1)
Author: Mark K5AM <k5am@zianet.com>
Date: Mon, 06 Jun 2011 23:14:20 +0000
From QEX: www.zianet.com/k5am/2mkw.pdf 73, Mark, K5AM www.zianet.com/k5am _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.com/mailman/lis
/archives//html/Amps/2011-06/msg00081.html (6,882 bytes)

11. Re: [Amps] 4CX1000A (score: 1)
Author: Mark K5AM <k5am@zianet.com>
Date: Fri, 27 Jan 2012 21:00:38 +0000
Roger, This is a common problem, but may have solutions. It would be interesting to hear the details. All parameters, level of drive, duty cycle, grid current, ALC details if used, screen supply deta
/archives//html/Amps/2012-01/msg00215.html (9,458 bytes)

12. [Amps] Simple regulated screen supply for 4CX1000A (score: 1)
Author: Mark K5AM <k5am@zianet.com>
Date: Mon, 30 Jan 2012 18:51:28 +0000
There have been several posts looking for a screen regulator. I use a simple two-transistor regulator for a 4CX1000A. This has worked fine with no trouble for 17 years in a 2M amp. Details on page 7:
/archives//html/Amps/2012-01/msg00300.html (6,560 bytes)

13. [Amps] Solder flux (score: 1)
Author: Mark K5AM <k5am@zianet.com>
Date: Sun, 26 Aug 2012 19:18:03 +0000
More easily, a drop of liquid flux, and reheating, will brighten up the connection. 73, Mark, K5AM www.zianet.com/k5am _______________________________________________ Amps mailing list Amps@contestin
/archives//html/Amps/2012-08/msg00449.html (8,205 bytes)

14. Re: [Amps] Solder flux (score: 1)
Author: Mark K5AM <k5am@zianet.com>
Date: Mon, 27 Aug 2012 16:23:49 +0000
Why is new solder better? Mark, K5AM _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.com/mailman/listinfo/amps
/archives//html/Amps/2012-08/msg00473.html (9,788 bytes)

15. Re: [Amps] Amp output power (score: 1)
Author: Mark K5AM <k5am@zianet.com>
Date: Tue, 25 Aug 2015 17:30:27 +0000
How about a pair of 4-400As ... Yes, the Eimac 4-400A is a good tube. Still running at full output after 54 years, with the original tubes: http://www.zianet.com/k5am/amps/6mkw.html Input for full o
/archives//html/Amps/2015-08/msg00091.html (9,304 bytes)

16. Re: [Amps] Amp output power (score: 1)
Author: Mark K5AM <k5am@zianet.com>
Date: Tue, 25 Aug 2015 18:31:00 +0000
That is an amazing amplifier. Did you build it yourself? 73, Bill W6WRT Yes, at age 28. My first amp was built in high school, age 17, still running after 65 years. Now only 82, and planning the nex
/archives//html/Amps/2015-08/msg00094.html (9,372 bytes)

17. [Amps] Regulated heater supply (score: 1)
Author: Mark K5AM <k5am@zianet.com>
Date: Fri, 4 Sep 2015 19:29:56 +0000
A regulated heater supply, with adjustable voltage, works very well. With current limiting at 10% above operating level, the inrush problem is also solved. One example, that has performed perfectly f
/archives//html/Amps/2015-09/msg00015.html (6,439 bytes)

18. Re: [Amps] 8877 heater inrush (score: 1)
Author: Mark K5AM <k5am@zianet.com>
Date: Tue, 26 Apr 2016 18:01:13 +0000
Alan G3XAQ, wrote about heater power supplies. - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - One way to control a heater power supply is shown at www.zianet.com/k5am/2mkw.pdf page
/archives//html/Amps/2016-04/msg00047.html (7,524 bytes)

19. Re: [Amps] Glitch resistor + fuse? (score: 1)
Author: "Mark, K5AM" <k5am@zianet.com>
Date: Mon, 13 Nov 2017 18:42:13 +0000
Re: [Amps] Glitch resistor + fuse? Resistors and fuses can offer good protection for a high voltage power supply. Another option is a high voltage overload relay, which can be quickly reset, avoiding
/archives//html/Amps/2017-11/msg00144.html (7,948 bytes)

20. Re: [Amps] Life of tubes in ham service (score: 1)
Author: "Mark, K5AM" <k5am@zianet.com>
Date: Wed, 27 Dec 2017 00:14:46 +0000
A recent post by Leigh, VK5KLT, suggested: One method for this is found on page 8 of: A Luxury Linear, QEX, May, 1996, 3-12. http://www.zianet.com/k5am/2mkw.pdf 73, Mark, K5AM _______________________
/archives//html/Amps/2017-12/msg00162.html (8,644 bytes)

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